偏压隧道斜交进洞法及其三维数值模拟研究

Study of Skew Bias Tunnel Crossing Method and Three-Dimensional Numerical Simulation

随着公路隧道环保建设理念的加强,隧道洞口的设计与施工都力求减少对周边自然环境的影响。斜交进洞法可有效避免洞口段大开挖,使隧道建筑与自然环境相协调,有良好的应用前景。结合具体工程,通过比选确定适宜的偏压隧道斜交进洞方案,对该方案施工要点进行简述,并对斜交进洞施工过程进行了数值模拟。研究表明,斜交进洞法能够保持洞口围岩稳定,可达到节约造价、缩短工期的目的。目前,相关设计方案已得到实施和运用。

Along with the strengthening of environmental protection in highway tunnel construction idea, design and construction of tunnel portal are trying to reduce the impact on the surrounding natural environment. It is showing good application prospects of oblique crossing method because it can effectively avoid the heavy excavation at the entrance zone of the tunnel and make the tunnel construction in harmony with the natural environment. In this paper combining with the specific project the appropriate unsymmetrically loaded tunnel＇s oblique crossing method is determined by comparison, and a brief description o~ the project construction is presented. In the end, the numeral simulation of the whole construction process of oblique crossing through holes is given. Research shows that oblique crossing method can not only maintain the stability of the entrance surrounding rock of the tunnel, but also reduce the cost and construction duration. At present, the relevant design scheme has been worked out and applied.